Covering: 2001. Previous review: Nat. Prod. Rep., 2002, 19, 494

This review covers the isolation and structure determination of triterpenoids including squalene derivatives, lanostanes, cycloartanes, dammaranes, euphanes, tirucallanes, tetranortriterpenoids, quassinoids, lupanes, oleananes, friedelanes, ursanes, hopanes, fernanes, sipholanes, isomalabaricanes, serratanes and saponins. The literature from January to December 2001 is reviewed and 242 references are cited.